Native example: void setup() { PORTB |= (1<<5); } Resultant code: 00000102 : 102: 2d 9a sbi 0x05, 5 ; 5 Arduino example: void setup() { digitalWrite(13, HIGH); } Resultant code: 00000102 : 102: 8d e0 ldi r24, 0x0D ; 13 104: 61 e0 ldi r22, 0x01 ; 1 106: 0e 94 86 00 call 0x10c ; 0x10c 10a: 08 95 ret 0000010c : 10c: 48 2f mov r20, r24 10e: 50 e0 ldi r21, 0x00 ; 0 110: ca 01 movw r24, r20 112: 82 55 subi r24, 0x52 ; 82 114: 9f 4f sbci r25, 0xFF ; 255 116: fc 01 movw r30, r24 118: 24 91 lpm r18, Z+ 11a: ca 01 movw r24, r20 11c: 86 56 subi r24, 0x66 ; 102 11e: 9f 4f sbci r25, 0xFF ; 255 120: fc 01 movw r30, r24 122: 94 91 lpm r25, Z+ 124: 4a 57 subi r20, 0x7A ; 122 126: 5f 4f sbci r21, 0xFF ; 255 128: fa 01 movw r30, r20 12a: 34 91 lpm r19, Z+ 12c: 33 23 and r19, r19 12e: 09 f4 brne .+2 ; 0x132 130: 40 c0 rjmp .+128 ; 0x1b2 132: 22 23 and r18, r18 134: 51 f1 breq .+84 ; 0x18a 136: 23 30 cpi r18, 0x03 ; 3 138: 71 f0 breq .+28 ; 0x156 13a: 24 30 cpi r18, 0x04 ; 4 13c: 28 f4 brcc .+10 ; 0x148 13e: 21 30 cpi r18, 0x01 ; 1 140: a1 f0 breq .+40 ; 0x16a 142: 22 30 cpi r18, 0x02 ; 2 144: 11 f5 brne .+68 ; 0x18a 146: 14 c0 rjmp .+40 ; 0x170 148: 26 30 cpi r18, 0x06 ; 6 14a: b1 f0 breq .+44 ; 0x178 14c: 27 30 cpi r18, 0x07 ; 7 14e: c1 f0 breq .+48 ; 0x180 150: 24 30 cpi r18, 0x04 ; 4 152: d9 f4 brne .+54 ; 0x18a 154: 04 c0 rjmp .+8 ; 0x15e 156: 80 91 80 00 lds r24, 0x0080 15a: 8f 77 andi r24, 0x7F ; 127 15c: 03 c0 rjmp .+6 ; 0x164 15e: 80 91 80 00 lds r24, 0x0080 162: 8f 7d andi r24, 0xDF ; 223 164: 80 93 80 00 sts 0x0080, r24 168: 10 c0 rjmp .+32 ; 0x18a 16a: 84 b5 in r24, 0x24 ; 36 16c: 8f 77 andi r24, 0x7F ; 127 16e: 02 c0 rjmp .+4 ; 0x174 170: 84 b5 in r24, 0x24 ; 36 172: 8f 7d andi r24, 0xDF ; 223 174: 84 bd out 0x24, r24 ; 36 176: 09 c0 rjmp .+18 ; 0x18a 178: 80 91 b0 00 lds r24, 0x00B0 17c: 8f 77 andi r24, 0x7F ; 127 17e: 03 c0 rjmp .+6 ; 0x186 180: 80 91 b0 00 lds r24, 0x00B0 184: 8f 7d andi r24, 0xDF ; 223 186: 80 93 b0 00 sts 0x00B0, r24 18a: e3 2f mov r30, r19 18c: f0 e0 ldi r31, 0x00 ; 0 18e: ee 0f add r30, r30 190: ff 1f adc r31, r31 192: ee 58 subi r30, 0x8E ; 142 194: ff 4f sbci r31, 0xFF ; 255 196: a5 91 lpm r26, Z+ 198: b4 91 lpm r27, Z+ 19a: 2f b7 in r18, 0x3f ; 63 19c: f8 94 cli 19e: 66 23 and r22, r22 1a0: 21 f4 brne .+8 ; 0x1aa 1a2: 8c 91 ld r24, X 1a4: 90 95 com r25 1a6: 89 23 and r24, r25 1a8: 02 c0 rjmp .+4 ; 0x1ae 1aa: 8c 91 ld r24, X 1ac: 89 2b or r24, r25 1ae: 8c 93 st X, r24 1b0: 2f bf out 0x3f, r18 ; 63 1b2: 08 95 ret